1. Characteristic curves of dental x-ray film;Havukainen;Oral Surg,1986
2. An introduction to the physics of diagnostic radiology;Christensen,1978
3. Radiation safety and protection in US dental hygiene programs;Farman;Oral Surg,1986
4. Dental radiologic survey of Virginia and Florida;Kaugars;Oral Surg,1985
5. Population exposure to X-rays: US 1970;Bureau of Radiological Health and Health Services and Mental Health Administration,1973